Question about Uniden GRANTLT 40-Channels Base CB Radio

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I installed a Grant XL SSB/AM mobile radio in my vehicle and it has power but nothing else. I usually have background noise, but nothing. The radio was removed from my vehicle for about 4 months and then reinstalled. It worked fine when I removed it. What could have happened??

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Honestly I think we've all had this happen. Normally its the obvious things...first thing I would do is check the mic. If the mic is bad then you won't hear anything. Happened to me and I checked everything....then a friend grabbed his mic and it worked perfectly. If its not that I'd check the coax cable....or possibly the mount for your antenna. If you took the mount down from the last use, did you put the nylon spacer to isolate the antenna from the mount? Its not the radio, its more than likely just something you overlooked....Keep me posted on your progress! Good Luck!

Posted on Apr 24, 2009

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How to install talk back in grant xl


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Just purchased a new galaxy dx959. Coax and k40 10k watt antenna. Installed it in my peterbilt 379. I have a lot of background noise. I tried unhooking the coax from back of radio and the noise goes...


You probably have the 959 that has a MOSFET final. It is not recommended that you try to get more power/mod by just turning pots. This can shorten the life of the MOSFET drastically. I normally set the power output to 7 watts and the mod to 100%. This give around 30 watts peak on AM and around 25-30 watts sideband. You need proper test equipment to align the radio.

As far as background noise, this type of radio does have more that others. Make sure the Noise blanker and ANL are turned on. If you are getting noise from equipment in the vehicle, you should take your truck to a good CB shop. They can find out what is causing the noise and fix it.

....Don at NTCB, Inc.

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Hooking up new antenna on jeep spare tire carrier, with a stud mount. drilled tire carrier, installed antenna, turn on radio and nothing. discovered post on stud mount can't touch tire carrier. I then...


CB radios are AM radios operating in the 27Mhz band and are prone to noise even in home installation (though admittedly not as much). A signal on the meter that causes the indicator to move up to as much as 1/4 of the scale is actually pretty good for a mobile installation with the engine running. There are ways to minimize the noise, but none will eliminate it. Here are suggestions - in no particular order:

1) A well grounded antenna. Since you've got metal to metal contact with yours it shouldn't be a problem - the magnetic mounts are more prone to interference and noise that yours.

2) Locate the antenna on a large, flat, horizontal, metal surface. Mobile installs are always a compromise - but the more of these you can incorporate, the better the reception & transmission will be. There will still be noise - but when you receive better signals the "S/N" or "signal to noise ratio" increases - making the sound less noisy.

3) Tune the antenna for lowest SWR (standing wave ratio). You'll need an SWR meter to do this. Be sure to get one that will tune HF antennas - or at least one that works in the 27Mhz band. This is another method of improving the S/N ratio mentioned above. An untuned antenna can cause a transmitter to fail - so this is a must for any transmitter's antenna.

4) Obtain the power directly from the battery. Not the accessory terminal or battery terminal under the dash - but to the battery posts themselves. This is the cleanest (power-wise) source in the vehicle.

5) Install filter on the power lines feeding the radio. A rising and falling (with engine RPM) whine sound is usually alternator noise, and a popping sound is ignition noise. The whine sound can be helped by install a capacitor and the ignition noise by using an inductor or coil. So, if you have both noises, you'll need both filters.

6) Install resistor spark plugs and wires. Years ago, we had to get these as an aftermarket item. I don't know if those supplied by auto manufacturers are resistor types or not - so it may be worthwhile to check it out.

Some vehicles benefit greatly from one or more of these solutions, others - not so much. Some vehicles have noisy subsystems unrelated to ignition or alternator. Some tank mounted fuel pumps can be brutally loud and difficult to silence (check with radio on, and turn the key to run - the fuel pump usually runs for a few seconds - listen for static while the pump runs before starting). The vehicles that will probably have good luck are those that you see used as police, taxi and ambulance vehicles due to the radios and electronics in them.

I hope this helps and good luck! Please rate my reply - thank you.

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Probably VR 10 on that radio. You are not really de-tuning the radio, just reducing the carrier power on AM. If you're driving something else, You may also want to adjust VR 11 for a reduction on SSB

Apr 02, 2010 | Uniden GRANTLT 40-Channels Base CB Radio

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http://www.cbtricks.com/radios/uniden/grant/graphics/grant_sch.pdf

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2 Answers

Background noise


I'm not an expert but I am a daily operator. First check your ground connection, just because the radio turns on doesn't mean the ground is good enough. If this unit is mobile there are several things you can do to reduce the noise. First you need to find out if the noise is coming in thruogh the antena or the power supply; turn on your radio and vehicle, unhook the antena. If the noise goes away or is reduced you know that it is RF noise. this is interference from some outside source, powerlines, TV, just about any thing that uses electricity or electronics can cause noise. relocating the antena may help. Check you antena connections. Check your SWR. This is only a few of the things you can check.

Apr 06, 2008 | Connex 4600 Base CB Radio

1 Answer

Audio limiter


tintlady, here is the info you requested;
the AM limiter is R 276

These are the variable adjustments inside,and what they control.
VR-1 AM S-METER
VR-2 SSB S-METER
VR-3 SSB SQUELCH RANGE
VR-4 AM SQUELCH RANGE
VR-6 SSB CARRIER BALANCE
VR-7 TX OFFSET
VR-9 RF METER
VR-10 FINAL BIAS
VR-12 DRIVER BIAS
VR-13 SSB ALC
VR-14 AM HIGH POWER
VR-15 AM MODULATION METER
VR-16 AM MODULATION
VR-17 SSB POWER
VR-18 AM LOW POWER
VC1-10.240 MHz Frequency adjustment

Hope this helps you out, let me know,,Mechanic

Jan 20, 2008 | Radio Communications

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